Kinds of atoms, elements and compounds

10 important questions on Kinds of atoms, elements and compounds

Is a metal a element?

yes, you will only find one kin of atom

How many elements are there we call metals?

70 kinds of atoms we count as metals, therefore 70 elements we call metals.

What are the 4 characteristics that all metals have in common?

- have a shiny surface
- conduct heat and electricity
- are malleable, especially when they are hot
- can, when molten, be mixed with other metals
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Based on their resistance to corrosion in which 4 groups can we distinguish the metals?

precious metals, semi-precious metals, reactive metals and highly reactive metals

Why do (very) reactive metals rarely have a shiny surface?

because the surface of the metal is covered in layer of oxide.

What are light metals?

metals with a small density

Why is titanium suitable material for supersonic aviation and space travel?

it is a metal which combines a small density with a comparatively high melting point.

What are compouns, containing a number of heavy metals?

extremely poisonous

What can differ from a alloy or the separate mixture?

the alloy often has very different properties
melting point of alloy can differ greatly with separate metals

What is the melting fuse?

the part that melts in a sprinkler and opens the valve

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